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Investigation Of Nitrification And Nitrogen Removal From Centrate In A Submerged Attached Growth Bioreactor: 2 Ammonia Oxidation To Nitrite

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The purpose of this study was to investigate the oxidation of ammonia to nitrite from centrate produced in the dewatering process of anaerobically digested sludge, using a single-unit, singlezone submerged attached growth bioreactor (SAGB). The nitrogen loading varied from 1.45 – 3.25 kg-N/m3-day and the organic loading varied from 0.21 – 1.62 kg-BOD5/m3-day. The quantity the biomass in terms of volatile solids (VS) ranged from 4,111 to 14,165 mg-VS/l of media. The quantity of suspended solids in the interstitial volume of the reactor averaged 107 mg-VS/l. An average ammonia oxidation (i.e. nitritification) efficiency of 97.8% was achieved while the average denitrification efficiency was 26.7% and in some cases was achieved without the requisite quantity of organic carbon, indicating that some autotrophic denitrification may have occurred. The average total nitrogen removal was 25%. Inhibition of nitrite oxidation by free ammonia resulted in the accumulation of nitrite, while inhibition of ammonia oxidation by free nitrous acid did not occur.

Document Type: Research Article


Publication date: January 1, 2007

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